Right, I have a Toshiba A100 Satellite Pro Model #: PSAACE-008002EN I'm thinking about upgrading the RAM/Memory, someone said to add 1gb ram to it, which would make one slot 512mb and the other 1gb. Now I'm wondering the maximum memory I can have for this laptop. Apparantly I need PC2-4200 memory, so I searched for it and found this: http://www.overclockers.co.uk/showproduct.php?prodid=MY-096-CR&groupid=701&catid=8&subcat=697 But I'm not sure if my laptop can use 4gb memory, apparantly some have maximum of 2gb. Can someone help please? Also, the laptop uses a ATI Mobility Radeon X1400, is it possible to upgrade this memory card? Or is this memory card even good?